I've had a litttle tic tic tic leak forever on my RR . I replaced the exhaust flanges, half the exhaust and numerous gaskets with no luck. I was thinking they might be leaking at the manifold gasket surface. It has the stock waffled tin gaskets. I also need to reseal the manifold stud treads since they leak a little. Whats a good sealer to use on the studs. My plan was to remove the manifolds, sandblast, Por 15 manifold grey paint, have them resurfaced, new Mr Gasket hi temp gaskets and reseal the stud threads. Am I missing anything.? Thanks